Mutual correlation for high-precision amplitude and phase noise measurements, even on pulsed signals. Frequency range from 1 MHz to 56 GHz, up to 325 GHz with external mixers. Internal source for measuring residual phase noise up to 54 GHz, including pulsed signals. Supports external heterodyne inputs for measuring absolute or residual phase noise up to 56 GHz. SCPI recorder for simplified code generation.